This is a late 1920's to early 1930's American oak sideboard with mirror.

This sideboard has a current value of $700 to $900 retail and an insurance/replacement value of $2500.

Some sites that I recommend are Varagesale.com, Chairish.com, Ioffer.com, Furnishly.com, Deconet.com, Lushpad, Krrb.com, and letgo.com.You can also go to invaluable.com or liveauctioneers.com and search their directory for an auction house near you and consign to them.It is important for you to click the stars after you have read this answer.